Instructables
I wanted a simple iPod amp for my garage. You need listen to something when you are working on your bike right?

I only had one extra stereo speaker, so I only made it mono. If you have two speakers, just make this twice and you have a stereo amp.

The name of the game here is simple, but feel free to make it more complicated and nicer if you feeling the urge.

I also included steps on how to fit this in a army surplus case and make it a portable amp for your ipod.
UPDATE: I have kits
I have been asked for parts and where to get them a lot since I posted this. If anyone is interested I have kits now with everything you need to build this for $50 + $5 shipping.

Send me a PM with your email address if you are interested.

Thanks,
-Joe
 
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Step 1: Parts

Parts:
-Radio Shack Phono(RCA) Jack 274-346 $3.99
-4 small nuts and bolts.
-Radio Shack DC Power Jack - 274-1576 $2.59
-Any old 8-12V wall wart that fits the power jack. $Free
-Radio Shack project box 270-283 $3.99 .
-Velleman 7W Mono Amp K4001 $10.00

If you make the portable model
-2 9V snap connectors 270-324
-2 9v batteries $5.00
-Power switch 275-612 $2.99
-470 ohm resistor
-LED
-Army Surplus box ??? I used a signal light box.
-Old computer speaker
-Old earphones or some old 1/8" stereo jack headphone jack.
-Piece of screen
-4 nuts and bolts

Tools:
Drill
Soldering Iron
Tin Nibbler
Screw drivers
Wire strippers
Needle Nose Pliers

Step 2: Assemble the amp.

Assemble this Amplifier kit and make sure it works. The kit comes with instructions but the PDF is available on the Velleman website www.vellemanusa.com. If the idea of soldering the kit up is a little intimidating they also sell the kit assembled for $1.00 more.
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takboilaw3 years ago
This is not much of a help I want to build an amplifier from the scratch meannig not from a discarded or pre existing computer amplifier from a desktop nor laptop speaker system.

This is much more of putting together all working pieces muck more like a jigsaw puzzle.

Its is much better if there was an schematics like a stereo amplfier with sub woofer output power by DC 12 volts that has an ouput of 200w per channel.


It's easy to make an amplifier circuit.
If anyone is interested, if you google the TBA820M power amp IC, its a great sounding little amp circuit and the test/application circuit is included in the data sheet all you do is change one value of resistor for the gain, I use it in my school and each circuit works out a lot less than $10, just means you need to be handy with making you own PCBs or vero/strip boarding. Also it runs well off a 9V battery
tonybowles3 years ago

I like this iPod amp. This is what real hobbyists / enthusiasts are made off!
I used to like tinkering around with electronics and making various devices.

Tony
Rahul163 years ago
can u please provide me the amplifier circuit diagram with exact component listed....
joe (author)  Rahul163 years ago
Hey Rahul - The amplifier kit from Velleman includes the instructions and all needed parts are included for the amplifier circuit.

-Joe
you could've just cut out the seperators you know :P
joe (author) 6 years ago
I Have Kits!

I have been asked for parts and where to get them a lot since I posted this. If anyone is interested I have kits now with everything you need to build this for $60 + shipping.

Send me a PM with your email address if you are interested.

Thanks,
-Joe
epicelite joe4 years ago
Where did you find that box!? I want one! D:
sqeeek4 years ago
Lol I've put pencils and screwdrivers through my speakers more than once. A little bit of screen isn't a bad idea.
I haven't learned much about electronics, but this makes your ipod or mp3 player be able to "power" a large speaker? I tried once connecting my iPod to a small radio speaker I salvaged, but the sound was really quiet. This would theoretically make it louder? Thanks
Yes, by the looks of this amp it should be VERY loud, running off two 9v. If you're looking to do something less complicated, you can salvage and old personal radio into an amp, but some components may require changing (resistors) otherwise it will be very distorted, plus it only uses 3v instead of 18v.
sqeeek xAxrules4 years ago
I've made some out of old computer speakers before. Many of them will run off of 9v/12v. Or you can keep the original plug and just plug them in.

I've found that many computer speakers can be greatly improved by putting them in a good box :)
Your mp3 player doesn't power the speakers, the 2 9V batteries power it ;)

The very quiet bit is still there, but it's amplified using the batteries (doesn't drain your ipod, big plus also :P)
foxtrot46974 years ago
Hawt Case
RedFilter5 years ago
I am about to start this project for my Zune using a dry box and a marine speaker for canoeing, but the one thing I am tring to figure out is if the speaker magnet will wipe out my Zunes hard drive. Anyone?
If it uses a hard drive instead of flash memory, more than likely, you want to keep as much distance between the zune and speaker as possible, between 10 and 20 cm should be fine.
gabi19885 years ago
hi, i want to build a small amp like this but i want to know if i would be able to plug my guitar into it!? it has an output jack for an electric guitar right.
franzwa6 years ago
I want to built a system like this but louder. Can you help me?
Xellers franzwa6 years ago
vacuum tube amp!
pyro-jim6 years ago
sorry the bottom pin was supposed to be two spaces along so that it went just below the gap
pyro-jim6 years ago
hi, great instructable, i was just wondering I have an amp that I made in a resistant materials class at school and I wanted to make it a stereo amp. How do I split the channels? I believe it is using the jack connecter but if so then which pins do I use? On the PCB they go. || || |
dbtahoe8 years ago
I am interested in this concept for speakers on my boat. I would love to know if you think it has enough power to be heard over the engine. Thanks, Doug
joe (author)  dbtahoe8 years ago
Doug, well it without a doubt loud! And on the boat I guess you have 12v so you power as many of them as you want. Go for it, Velleman also sells a 25W stereo amp that you might want to check out, that way you could enjoy the stereophonic sound while you are in your boat. -Joe
Derin joe6 years ago
will it work with 2 amp circuits in series to add onto the power?
yea. thats what i did
i doubt this has enough power. it would be great when the engine is off however and it looks friggin awesome! i've got 2x 250w speakers on my tower and i can barely make out what's being played when i ride, they are long throw woofers, and they are on BLAST. forget about hearing the low range of music regardless of how loud it is, it all blends in with with the vibrations of the motor and the water. good luck with your boat!
electrian126 years ago
This is awesome, but where do you get that army surplus box?!?!? But good job though
TKEdwin5826 years ago
This is pretty dang nifty. I'd make one, but I've never been good at technical-stuff... LoL.
nuffun14406 years ago
How many watts is the speaker? great instructable, this has really inspired me to try something
=SMART=6 years ago
wow brilliant look! rough and tough!
tecno geek6 years ago
confusing, but i like it. good job!
alexhalford6 years ago
This may sound like a stupid question but could someone please explain to me how an amp works. i.e. why couldn't you just have a variable transformer (as the power supply) and the input signal controlling a transistor??? Any help appreciated.
Wolfpack8716 years ago
What all do they sell in army surplus stores? I've never been to one. That box is pretty sweet though.
alot like the foxhole army place in puyallup
bdu's flak jackets, old guns, military helmets, gas masks, and much more
Brennn107 years ago
Awesome use of another kit to make this. It makes it 10X easier for everyone, so that they dont actually have to make the PCB. Good Work.
zman1238 years ago
can you hook a guitar up to it ???????????? ? 00 ~
my guitar hook up is a adapter to a rca conecter wired straight to my stereo, im to cheap to buy an amp
exabopper7 years ago
This is very clever - I bought a set of amplified speakers at a clearance store for about $10, and I have an old army first-aid box - I'm going to use them, along with my jigsaw (with a hacksaw blade) to make this project soon.

That said, I hate to tell you this, but your idea has a problem. The amp you are using is mono, and you say that you have attached both channels from the iPod into the one input connector on the amp.

Imagine this - you are listening to a tune on the iPod, and that tune for whatever reason is only on one channel, either left or right (Pink Floyd does this sometimes, so that it seems like the music is coming from the right, then the left, etc). This means that there is high voltage on one channel, and zero volts on the other. When you connect high voltage to zero voltage, that is called a SHORT CIRCUIT - the left channel is shorting to the right or vice versa, and it stresses the circuit. In general, you should NEVER attach two outputs together without some circuitry in between, or you may see fireworks in the future.

The iPod is probably designed to handle some shorts, but if I were you, I'd put resistors in series with each individual channel , and then a resistor between the amp's input and neutral. This is called an isolation pad, and it protects the iPod's outputs. I'd use maybe 2.2Kohms for each of the three resistors (you should experiment with this on a breadboard - you may not need the resistor between input and ground depending on the amp's impedance). Granted, it will attenuate the signal, so it will sound softer, but if you have a good strong amp, just crank it a little more. At least then the iPod will be protected.

Once again, hell of a good idea for iPod use in rough conditions. You could even waterproof that that thing!
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